exhaust backfire


Information and questions on GL1100 Goldwings (1980-1983)
  • Sponsored Links
Post Reply
blackbeauty
Posts: 14
Joined: Sat Jul 09, 2011 10:33 am
Location: Stanton,Michigan
Motorcycle: 1980 gl1100 Interstate
1977 gl1000

exhaust backfire

Post by blackbeauty » Mon May 26, 2014 9:55 am



I have an 80 wing and replaced the stock exhaust with a set of fishtail pipes over the winter, I am getting a pop while riding and also on slowing down. The bike is getting about 38 miles to the gallon and runs ok. It does have a fall on its face at above 5500 rpm, but just cruising it does good. I synced the carbs this spring. Am I looking at timing issues. What if any problems can come from this.

Thanks



User avatar
Sidcar
Posts: 594
Joined: Thu Jul 05, 2012 3:07 pm
Location: Birmingham, England, United Kingdom
Motorcycle: 1995 GL1500 SE (20th Anniversary) and Squire RX4 sidecar

Re: exhaust backfire

Post by Sidcar » Mon May 26, 2014 2:30 pm

Check for an air leak on your exhaust. Any air drawn in through the leak on overrun will cause popping back in the exhaust.

Sid

User avatar
themainviking
Posts: 2920
Joined: Wed Sep 29, 2010 6:59 pm
Location: North Bay, Ontario, Canada
Motorcycle: 2009 GL1800 AD

Re: exhaust backfire

Post by themainviking » Mon May 26, 2014 2:53 pm

Also, you may have created a lean condition with the fishtails if they have no baffles in them, which could cause the popping you are experiencing on decelaration. Installing baffles in the fishtails could eliminate your problem, although definitely check for a vacuum leak as mentioned above.
It ain't about the destination - it's all about the journey

ImageImage

User avatar
dingdong
Posts: 3232
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: exhaust backfire

Post by dingdong » Tue May 27, 2014 6:11 am

Another possibility: Your carbs have "air cutoff valves" that are designed to eliminate backfire on deceleration. One or more could be bad.
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

User avatar
Bogator
Posts: 87
Joined: Sat Aug 13, 2011 2:58 pm
Location: Valley
Motorcycle: 1998 valkyrie

Re: exhaust backfire

Post by Bogator » Sun Jun 01, 2014 6:09 am

OK, this is what I found on my Valkyrie, vacuum lines --rotten---I replaced all ,and then I tightened all header bolts, be careful with these and don't over tighten, you might find another problem with the wiring but ---try --the first of these and then see hope this helps GOD BLESS


GOD BLESS

Post Reply